Door-lock attachment



Patented Sept. 10, 1929.

UNITED STATES JOHN E. BARTLETT, OF SAN FRANCISCO, CALIFORNIA. i

DOOR-LOCK ATTACHMENT.

Application filed January 3, 1928. I Serial n." 244,181.

My invention relates to improvements in attachments for locks of the type wherein a slidable spring bolt is arranged to extend between the sash and jamb of a door or the a, like to prevent the manipulation and unauthorized opening of the lock by an instrument inserted between the sash and jaInb.

In mounting swinging doors and the like, a considerable clearance is commonly left 10 between the edges of the door sash and jainb to provide for possible swelling or expansion and to permit the tree swinging of the door.

This clearance is frequently greatly increased by the shrinking of the door sash after the 15. door is hung. Locks are commonly mounted upon the door sash, said locks being provided with slidahle bolts arranged to extend from the edge of the sash into a recess formed in the adjacent jamb, a striker plate being mounted upon the jainb to protect. said jainb from injury and marring of the jamb by the bolt. It has been found that such bolts, particularly bolts of the beveled latch type such as provided upon spring locks, night latch locks, and the like, may be readily manipulated and the door unlocked by inserting a strip of thin flexible material, such as celluloid, between the sash and jamb, the flexible material being such that it can be worked around the corner between thesash and jamb through the clearance commonly allowed, a practiced manipulation of the flexible strip operating to force back the bolt and permit the unauthorized opening of the door.

The present invention is directed to an improved device which will prevent a lock bolt from being engaged and manipulated in the above manner, the primary object being to provide an improved attachment which will effectually prevent the insertion of an instrument into prying engagement with the bolt.

Another object is to provide an improved device of the character described which may be easily and quickly applied and which may be used with many types of looks.

A further object is to provide a device which may be installed in connection with previously installed locks without eiiecting the operation of the lock and without altering the appearanceofthe door or look.

i A still further object istonrovideaninr proved device. which can be manufactured at a noininal cost and which can be simply inv stalled. y r 1 g, I

.I- accomplish these and other objects by means of the improved device disclosed in the drawings forming a part of the present application wherein like. characters of ref- 60. erence are used to designate similar part's throughout the specification and drawings, and in which- I Fig. l is a horizontal section View of a portion of a doorsash and jamb showing my I attachment applied thereto; I V

Fig. 2 is a broken side elevation partlyin vertical, section of the sash and jainb with the attachment as shownin Fig. l; a ,1 v

Fig. is a front elevation ofthepreferred; 79; form of my attachment;'and f Fig. 4 is a broken front elevation of a modified construction of the device; 1

Referring to the drawings, the numerals 1, and 2 are used to designate in general the sash 7 6 and amb respectively of a door. A lock d'es ignated in general bythe numeral 35, is in stalled in the sashl in the ordinary manner, said lock being of any ordinary construction providedwith a locking bolt't arranged to 80 extend into engagement with a recess .6- formed in the'jainb 2 opposite said lock and bolt. A striker plate 7 is mounted upon the face of the jamb 2 to protect said jamb from injury-by the bolt in the ordinary manner.

Stops 8 are rigidly mounted betweenthe jamb Zand the sash 1, said stops being ar- 7 ranged to extend substantially, across the clearance between the j amb and the sash 1 adjacent the bolt 4." In the preferredconstruc- 90. tion, the stops 8 are formed integrally with. the striker plate 7 by striking out portions of the plate-and shaping said portions to form extensions extending'outwardly at substan tially right angles to the face of the plate 7. v

The outer ends are preferably bent away'frorn the boltd at substantially right anglesitothe outwardly extending portions of the stop-.1 The stops 8 are preferably formed at each side of the bolt 4 adjacent the upperv and low-' 10o.

er edges thereof. If desired, the stops 8 an instrument inserted between the sash and may be formed upon a separate plate 9 as jamb.

shown in 4, said plate 9 being arranged to In witness whereof, I hereunto set my sigbe secured between the sash and the outer nature.

face of the striker plate 7. i JOHN E. BARTLETT. 0

The striker plate 7 disclosed in the drawings is of the, type used for double bolt door locks whereina slidable bolt is provided in addition to the ordinary spring latch bolt. As only the spring latch bolt can be readily manipulated, the stops 8 are formed adjacent this bolt only. In the modified construction. shown in Fig. 4, the plate 9 is made in a U shape to permit the movement of the upper 1 bolt therethrough, the stops 8 being formed i upon the endsof the arms of the U; I

In operation, the stops 8 guard the edges of the bolt 4 so that a flexible instrument 11, such as a strip of celluloid orthe' like, such as 2 might be bent around the corner of the sash as shown in Fig. 1, cannot be worked'up or down against the beveled edge of the'bolt i to force the same back within the door lock. By placing the stops upon both sides, as well as 25 above and below the bolt, the bolt is guarded I I against engagement even though the instrument be placed at an angle such that a single stop upon either side of the bolt might be avoided, the arrangement of the stops in pairs v 30 operating to insure that the instrument will s be engaged and prevented from contacting with the bolt. Theouter ends of the stops, being turned away from the bolt, form hooks, constituting obstructions preventing the in- 35 istrument from being worked past the stops. I i

While I have illustrated and described only in the preferred forms, the device is obviously subject' to modification in various ways without departing from the spirit of my inaovention. I therefore do not wish to restrict V i myself to the specific forms and arangement shown, but desire to avail myself of all modificationsi'which'may fall within the scope of the appended claims. 45 Having thus described my invention what I V I claim as new and desire to secure by Letters Patent is J 1. An attachment for door locks comprising a pluralityof stops mounted between the fio sash and jamb of adoor adjacent a slidable V V i 11.)

locking bolt said stops having hook shaped endsturned away from the bolt to prevent manipulationof the bolt by an instrument in ,r sert'ed between'the sashand amb. 7 2. vAn atttachment for door locks comprising a plate arranged to be secured upon adoor jamb opposite a lock mounted upon the edge of a door sash; and spaced extensions formed uponsaid plate and arranged to extend sub- V stantially across the, clearance between the sash and jamb above andbelow the bolt of the lock, the ends of said extensions being turned at substantially ri'ght angles away from the osbolt to Prevent manipulation of the bolt by 

